Augmented reality is a live direct or indirect view of a physical, real-world environment whose elements are augmented by computer-generated sensory input such as sound, video, graphics or GPS data. It is related to a general concept called mediated reality. As a result, the functions by enhancing one’s current perception of reality. By contrast, virtual reality replaces the real world with a simulated one, augmentation is conventionally in real time and in semantic context with environmental elements, such as sports scores on TV during a match. With the help of advanced AR technology the information about the real world of the user becomes interactive. Information about the environment and its objects is overlaid on the real world and this information can be virtual or real, e. g. seeing other real sensed or measured information such as electromagnetic radio waves overlaid in exact alignment with where they actually are in space. Augmented reality brings out the components of the world into a persons perceived real world. One example is an AR Helmet for construction workers which displays information about the construction sites, hardware components for augmented reality are, processor, display, sensors and input devices. Various technologies are used in Augmented Reality rendering including optical projection systems, monitors, hand held devices, a head-mounted display is a display device paired to the forehead such as a harness or helmet. HMDs place images of both the world and virtual objects over the users field of view. Modern HMDs often employ sensors for six degrees of freedom monitoring that allow the system to align virtual information to the physical world, HMDs can provide VR users mobile and collaborative experiences. Specific providers, such as uSens and Gestigon, are even including gesture controls for full virtual immersion, in January 2015, Meta launched a project led by Horizons Ventures, Tim Draper, Alexis Ohanian, BOE Optoelectronics and Garry Tan. On February 17,2016, Meta announced their product at TED. AR displays can be rendered on devices resembling eyeglasses, a head-up display, also known as a HUD, is a transparent display that presents data without requiring users to look away from their usual viewpoints. Near eye augmented reality devices can be used as portable head-up displays as they can show data, information, many definitions of augmented reality only define it as overlaying the information. CrowdOptic technology can be used by Google Glass users to learn where to look at a point in time. In January 2015, Microsoft introduced HoloLens, which is an independent smartglasses unit, First impressions and opinions have been generally that HoloLens is a superior device to the Google Glass, and manages to do several things right in which Glass failed. Contact lenses that display AR imaging are in development and these bionic contact lenses might contain the elements for display embedded into the lens including integrated circuitry, LEDs and an antenna for wireless communication
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